linux-kernel - [ 38/66] Bluetooth: Fix sending HCI commands after reset

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Message-Id: <20130217225006.051314504@decadent.org.uk>
Date:	Sun, 17 Feb 2013 22:50:39 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	akpm@...ux-foundation.org, Szymon Janc <szymon.janc@...to.com>,
	Johan Hedberg <johan.hedberg@...el.com>,
	Gustavo Padovan <gustavo.padovan@...labora.co.uk>
Subject: [ 38/66] Bluetooth: Fix sending HCI commands after reset

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Szymon Janc <szymon.janc@...to.com>

commit dbccd791a3fbbdac12c33834b73beff3984988e9 upstream.

After sending reset command wait for its command complete event before
sending next command. Some chips sends CC event for command received
before reset if reset was send before chip replied with CC.

This is also required by specification that host shall not send
additional HCI commands before receiving CC for reset.

< HCI Command: Reset (0x03|0x0003) plen 0                              [hci0] 18.404612
> HCI Event: Command Complete (0x0e) plen 4                            [hci0] 18.405850
      Write Extended Inquiry Response (0x03|0x0052) ncmd 1
        Status: Success (0x00)
< HCI Command: Read Local Supported Features (0x04|0x0003) plen 0      [hci0] 18.406079
> HCI Event: Command Complete (0x0e) plen 4                            [hci0] 18.407864
      Reset (0x03|0x0003) ncmd 1
        Status: Success (0x00)
< HCI Command: Read Local Supported Features (0x04|0x0003) plen 0      [hci0] 18.408062
> HCI Event: Command Complete (0x0e) plen 12                           [hci0] 18.408835

Signed-off-by: Szymon Janc <szymon.janc@...to.com>
Acked-by: Johan Hedberg <johan.hedberg@...el.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@...labora.co.uk>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/bluetooth/hci_event.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -1972,7 +1972,7 @@ static inline void hci_cmd_complete_evt(
 	if (ev->opcode != HCI_OP_NOP)
 		del_timer(&hdev->cmd_timer);
 
-	if (ev->ncmd) {
+	if (ev->ncmd && !test_bit(HCI_RESET, &hdev->flags)) {
 		atomic_set(&hdev->cmd_cnt, 1);
 		if (!skb_queue_empty(&hdev->cmd_q))
 			tasklet_schedule(&hdev->cmd_task);


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